本文实例讲述了android中viewflipper的使用及设置动画效果。分享给大家供大家参考，具体如下：
说到左右滑动，其实实现左右滑动的方式很多，有viewpaer，自定义实现viewgroup，gallery等都可以达到这种效果。这里做下viewfliper实现左右滑动的效果。
会用到以下的技术：
1、viewflipper
2、gesturedetector
3、animation
主要是这三个类在起作用。
viewflipper，不妨把它看做一个容器吧，你可以把许多的view放在这个容器中，让它展示给用户，虽然它每次只展示一个view，我感觉它的用途更好是作为广告展示，比如类似购物网站那样的广告滚动展示。比如可以设置自动播放功能，就可以滚动广告了！
原理：向左向右滑动主要是依赖手势来控制，手势向右滑动就调用 viewflipper.shownext()方法，同理，向左滑动就会去调用viewflipper.showprevious()方法。
效果图如下：
接下来直接上代码：
首先在布局文件中添加viewflipper的标签：
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<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="@drawable/pattern1" > <button android:id="@+id/treasure_chest_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignparentright="true" android:background="@drawable/treasure" /> <viewflipper android:id="@+id/viewflipper" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/treasure_chest_btn" > </viewflipper> <button android:id="@+id/garbage_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignparentleft="true" android:layout_below="@id/viewflipper" android:background="@drawable/garbage" /> </relativelayout> |
其次是在anim中定义动画：
slide_left_in.xml：
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<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <!-- 画面转换位置移动动画效果 开始向左动画 fromxdelta ： 动画开始时 x坐标位置 toxdelta ：动画结束时 x坐标位置 duration ：动画持续时间 --> <translate android:duration="800" android:fromxdelta="100%p" android:toxdelta="0" /> </set> |
slide_left_out.xml：
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<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="800" android:fromxdelta="0" android:toxdelta="-100%p" /> </set> |
slide_right_in.xml：
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<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="800" android:fromxdelta="-100%p" android:toxdelta="0" /> </set> |
slide_right_out.xml：
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<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="800" android:fromxdelta="0" android:toxdelta="100%p" /> </set> |
最后是activity中的实现：
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package net.loonggg.demo.slider; import android.app.activity; import android.os.bundle; import android.view.gesturedetector; import android.view.gesturedetector.ongesturelistener; import android.view.layoutinflater; import android.view.motionevent; import android.view.view; import android.view.view.ontouchlistener; import android.view.window; import android.view.animation.animation; import android.view.animation.animation.animationlistener; import android.view.animation.animationset; import android.view.animation.animationutils; import android.widget.button; import android.widget.imageview; import android.widget.textview; import android.widget.viewflipper; public class mainactivity extends activity implements ongesturelistener, ontouchlistener { private gesturedetector detector; private viewflipper myviewflipper; private int[] imgs = { r.drawable.img0, r.drawable.img1, r.drawable.img2, r.drawable.img3, r.drawable.img4, r.drawable.img5 }; private int displayedchildindex = 0; private button treasure_btn; private button garbage_btn; @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); requestwindowfeature(window.feature_no_title); setcontentview(r.layout.main); myviewflipper = (viewflipper) findviewbyid(r.id.viewflipper); treasure_btn = (button) findviewbyid(r.id.treasure_chest_btn); garbage_btn = (button) findviewbyid(r.id.garbage_btn); myviewflipper.setontouchlistener(this); myviewflipper.setlongclickable(true);// 设置长按事件 // myviewflipper.setautostart(true);// 设置是否自动播放，默认不自动播放 detector = new gesturedetector(this); addflipperview(); } /** * 向flipperview中动态添加view */ private void addflipperview() { for (int i = 0; i < imgs.length; i++) { view view = layoutinflater.from(this).inflate( r.layout.myviewflipper, null); textview title = (textview) view.findviewbyid(r.id.view_title); title.settext("头像"); imageview iv = (imageview) view.findviewbyid(r.id.view_image); iv.setbackgroundresource(imgs[i]); myviewflipper.addview(view); } } @override public boolean ondown(motionevent e) { return false; } @override public void onshowpress(motionevent e) { } @override public boolean onsingletapup(motionevent e) { return false; } @override public boolean onscroll(motionevent e1, motionevent e2, float distancex, float distancey) { return false; } @override public void onlongpress(motionevent e) { } @override public boolean onfling(motionevent e1, motionevent e2, float velocityx, float velocityy) { // 返回当前正在显示的子视图的索引 displayedchildindex = myviewflipper.getdisplayedchild(); final imageview iv = (imageview) myviewflipper.getchildat( displayedchildindex).findviewbyid(r.id.view_image); if (e2.getx() - e1.getx() >= 100 && e1.gety() - e2.gety() >= 100) { animationset outanim = (animationset) animationutils.loadanimation( this, r.anim.collect_treasure); iv.startanimation(outanim); outanim.setanimationlistener(new animationlistener() { public void onanimationstart(animation animation) { } public void onanimationrepeat(animation animation) { } public void onanimationend(animation animation) { shownextview(); animationset downanim = (animationset) animationutils .loadanimation(mainactivity.this, r.anim.up_or_down); treasure_btn.setanimation(downanim); iv.clearanimation(); } }); } else if (e1.getx() - e2.getx() >= 100 && e2.gety() - e1.gety() >= 100) { animationset outanim = (animationset) animationutils.loadanimation( this, r.anim.throw_garbage); iv.startanimation(outanim); outanim.setanimationlistener(new animationlistener() { public void onanimationstart(animation animation) { } public void onanimationrepeat(animation animation) { } public void onanimationend(animation animation) { shownextview(); animationset leftanim = (animationset) animationutils .loadanimation(mainactivity.this, r.anim.left_or_right); garbage_btn.setanimation(leftanim); iv.clearanimation(); } }); } else if (e1.getx() - e2.getx() >= 100) { shownextview(); } else if (e2.getx() - e1.getx() >= 100) { showpreviousview(); } return false; } private void showpreviousview() { myviewflipper.setinanimation(animationutils.loadanimation(this, r.anim.slide_right_in)); myviewflipper.setoutanimation(animationutils.loadanimation(this, r.anim.slide_right_out)); myviewflipper.showprevious(); } private void shownextview() { myviewflipper.setinanimation(animationutils.loadanimation(this, r.anim.slide_left_in)); myviewflipper.setoutanimation(animationutils.loadanimation(this, r.anim.slide_left_out)); myviewflipper.shownext(); } @override public boolean ontouch(view v, motionevent event) { return detector.ontouchevent(event); } } |
希望本文所述对大家android程序设计有所帮助。
